Kate Winslet and Katie Holmes unveil their latest fashion campaigns

With day jobs that equal lengthy periods on location away from their family and home comforts - not to mention the long hours, it's no surprise that Hollywood starlets like to diversify with the occasional quick modelling job.

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Working mothers Katie Holmes and Kate Winslet have been lured by big brands H.Stern and St John respectively, and their team of dedicated pamperers and preeners. The results of a day in the studio (or in the case of Katie Holmes, on a sun-soaked beach) could see them nominated for a Most Glamorous Performance in an Advertising Campaign award - if only such a thing existed.

Spring/summer 2012 marks the second season that British Oscar winner Winslet has modelled for American knitwear label St. John. Fellow actress Angelina Jolie previously enjoyed the same role for five years, but was replaced when the label's directors thought her fame had "overshadowed the brand."

Kate Winslet for St John

Katie Holmes meanwhile, has shot her third campaign for American jewellery H.Stern, alongside her other modelling assignment - for women's lifestyle brand Ann Taylor.

Keeping up? You'd be right for thinking that actresses have as many modelling gigs as they do film roles. Or in Katie Holmes's case, more…